[SR-Users] Size of passwords fields in db

Daniel-Constantin Mierla miconda at gmail.com
Thu Oct 6 16:12:49 CEST 2016

On 06/10/16 13:47, Fred Posner wrote:
> On 10/06/2016 05:43 AM, Daniel-Constantin Mierla wrote:
>> On 05/10/16 16:35, Fred Posner wrote:
>>> On 10/05/2016 10:25 AM, Daniel-Constantin Mierla wrote:
>>>> Hello,
>>>> writing here to decide on a topic opened by pull request 779:
>>>>   - https://github.com/kamailio/kamailio/pull/779
>>>> what would be a fair size for db column storing a password that one
>>>> would like to have for proper security?
>>>> I would like to make it consistent over all tables that have a password
>>>> column by defining a xml entity for the size of these columns. The pull
>>>> request suggests 64 chars, has anyone other opinions on making it larger
>>>> or smaller?
>>>> If they are defined varchar, then should not be a problem of allocated
>>>> size, so we can go with 128 if someone feels it worth doing larger now
>>>> so we don't have to change it again in the near future.
>>>> This change is about db schema, the modules I expect to work with
>>>> allocated strings (or have length checks) in this case and should not be
>>>> affected.
>>>> Cheers,
>>>> Daniel
>>> Although I can see why someone might consider the need for larger than
>>> varchar 64, I really don't see a need for it. Assuming if you needed
>>> more characters it would probably be time to use additional
>>> authentication methods.
>> That refreshed my mind that we have now support for sha 256, which means
>> that ha1 fields need to be 64 (and they are now), but wondering if
>> someone will want to have and add sha 512 any time soon, which means the
>> ha1 fields need to be 128...
> I guess there's really no cost to increasing it to 128 / sha 256 and
> give ourselves some good time before we need to reconsider. The storage
> cost will still be based on the actual value used and not the size
> constraint; giving people options.
To conclude: I increased the size of password fields to 64 and hashed
fields to 128.


Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Kamailio Advanced Training, Berlin, Oct 24-26, 2016 - http://www.asipto.com

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